Study on Condensation Heat Transfer Characteristics of Hydrocarbons Natural Refrigerants

  • Oh, Hoo-Kyu (School of Mechanical Engineering, Pukyong National University) ;
  • Park, Seung-Jun (Graduate School, Department of Refrigeration & Air-Conditioning Eng., Pukyong National University) ;
  • Park, Ki-Won (Department of Refrigeration Engineering, Yosu National University) ;
  • Roh, Geon-Sang (Refrig. & Air-Cond. Course, Tongmyung College) ;
  • Jeong, Jae-Cheon (Han Seo Engineering Corporation)
  • Published : 2001.09.01


This study investigated the condensation heat transfer coefficients of R-22, R-290 and R-600a inside horizontal tube. Heat transfer measurements were performed for smooth tube with inside diameter of 10.07 mm and outside diameter of 12.07 mm and inner grooved tube having 75 fins whose height is 0.25 mm. Condensation temperatures and mass velocity were ranged from 308K to 323 K and $51kg/m^2s$ to $250kg/m^2s$, respectively. The test results showed that the local condensation heat transfer coefficients increased as the mass flux increased, and also the effects of mass velocity on heat transfer coefficients of R-290 and R-600a were less than those of R-22. Average condensation heat transfer coefficients of natural refrigerants were superior to that of R-22. The present results had a good agreement with Cavallini-Zecchin's correlation for smooth and inner grooved tubes.